A case of neurilemoma on the palatal region of a 44 year-old man was observed.The patient noticed a tumor on the right palatal region during treatment for dental caries, and came to our hospital for an examination. No particular change in facial findings was observed, and a small tumor (about 15•~12 mm) covered with healthy mucosa was found in the right palatal region. The clinical diagnosis was p'eomorphic adenoma, and the patient was operated on under general anesthesia.Histopathologically, the tumor tissue was full of hyperplastic nuclear spindle cells partially in a shelf arrangement.S-100 protein staining by the PAP method gave a positive reaction. With scanning and transmission electron microscopy the tumor tissue appeared fascicular and had a convoluted arrangement in each direction. These findings were suggestive of a Schwann cell origin for the tumor.
One case of a benign cystic teratoma on the bottom of the oral cavity of an infant was obseved and reported. The occurrence of this tumor in the oral cavity is quite unusual.
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